Robert Kubica has admitted that it would be "nearly impossible" for him to return to the Formula One paddock, adding that he is fully focused on rallying.
The Pole is still recovering from an injury he suffered during a rally accident in 2011, during which his right hand was partially severed from his arm, which forced him to put his Formula One career on hold.
Since then, Kubica has continued rallying and was recently crowned the WRC2 champion and has been given a WRC berth for next weekend's Wales Rally.
When asked by the BBC if he would be interested to return to F1, Kubica admitted that he would be severely disadvantaged.
"I would be able to drive an F1 car on one or two circuits for testing. But it doesn't make sense to test for a day if I cannot race," the former Renault driver said.
"I think there is only one person who can judge what I can do behind the steering wheel - and that's myself.
"It's a dream, a target, but for now, it's very difficult - I would say nearly impossible. I will never take the opportunity if I don't feel 100% ready. If one day things improve, for sure we will see. For now, I am concentrating on rallying.
"I focus on my recovery - and rallying is helping me a lot in this.
"I can see a lot of improvement behind the wheel in a rally car. Driving on gravel is very demanding. There are lots of movements on the steering wheel which put a lot of stress on my arm and my hand.
"But I know this does not help my biggest limitation, which is driving a single seater. I do not have the power to take control of it but I will try my best."